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Merge pull request #29855 from lazerg:fix/issue-29854-empty-input-crash

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imgproc: reject empty input in connected components
This commit is contained in:
Alexander Smorkalov
2026-09-03 14:25:47 +03:00
committed by GitHub
parent 7b0ce2b50b e7652038ee
commit 1209808c70
2 changed files with 21 additions and 0 deletions
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1
modules/imgproc/src/connectedcomponents.cpp
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@@ -5650,6 +5650,7 @@ namespace cv{
template<typename StatsOp>
static
int connectedComponents_sub1(const cv::Mat& I, cv::Mat& L, int connectivity, int ccltype, StatsOp& sop){
CV_Assert(!I.empty());
CV_Assert(L.channels() == 1 && I.channels() == 1);
CV_Assert(connectivity == 8 || connectivity == 4);
CV_Assert(ccltype == CCL_SPAGHETTI || ccltype == CCL_BBDT || ccltype == CCL_SAUF || ccltype == CCL_BOLELLI || ccltype == CCL_GRANA || ccltype == CCL_WU || ccltype == CCL_DEFAULT);

20
modules/imgproc/test/test_connectedcomponents.cpp
View File

@@ -795,5 +795,25 @@ TEST(Imgproc_ConnectedComponents, regression_27568)
}
}
TEST(Imgproc_ConnectedComponents, regression_29854)
{
for (const Size& size : {Size(400, 0), Size(0, 400), Size(0, 0)})
{
Mat image = Mat::zeros(size, CV_8UC1);
for (const int connectivity : {4, 8})
{
for (const int ccltype : {CCL_DEFAULT, CCL_WU, CCL_GRANA, CCL_BOLELLI, CCL_SAUF, CCL_BBDT, CCL_SPAGHETTI})
{
Mat labels, stats, centroids;
EXPECT_THROW(connectedComponents(
image, labels, connectivity, CV_32S, ccltype), Exception);
EXPECT_THROW(connectedComponentsWithStats(
image, labels, stats, centroids, connectivity, CV_32S, ccltype), Exception);
}
}
}
}
}
} // namespace